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Ref. No.: ISO/R84-1959(E)
IS0
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
IS0 RECOMMENDATION
R 84
IZOD IMPACT TEST FOR STEEL
1st EDITION
February 1959
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
of ISO.
a member
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian.
Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 84, Izod Impact Test for Sleel, was drawn
up by Technical Committee ISO/TC 17, Steel, the Secretariat of which is held
by the British Standards Institution (R.S. I.).
At the first meeting of IS0 /TC 17, held in London, in June 1950, the Secre-
tariat submitted a first draft proposal for the Izod impact test, based on aBritish
standard. The Technical Committee instructed its Working Group No. 1,
Methods of Mechanical Testing for Steel, to examine this draft proposal and to
prepare a new version of it, taking into account certain observations put forward
by Member Bodies.
In April 1952, the Working Group submitted a second draft proposal,
which was discussed at the second plenary meeting of ISO/TC 17, held in New
York, in June 1952, and which was passed back to the Working Group so that
it might include therein data on tolerances.
The third draft proposal, submitted by the Working Group in November
1953, was studied by the Technical Committee during its third plenary meeting,
held in London, in December 1953, along with the comments of the Member
Bodies. The ISO/TC 17 Secretariat was then assigned to draw up a fourth
draft proposal incorporating the changes voted during the meeting, and this
was circulated in April 1954.
The comments of the Member Bodies on this fourth draft proposal were
discussed at the fourth plenary meeting, held in Stockholm, in June 1955, and
the Technical Committee decided to adopt it, subject to a few amendments, as
a Draft IS0 Recommendation.
On 31 October 1956, this Draft IS0 Recommendation (No. 135) was dis-
tributed to all the IS0 Member Bodies and was approved, subject to a few
modifications of details, by the following Member Bodies :
"Belgium India Spain
"Canada Ireland Sweden
Czechoslovakia Italy Turkey
Denmark Netherlands *Union of
Finland Pakistan South Africa
*Greece *Poland Yugoslavia
Hungary Portugal
One Member Body opposed the approval of the Draft: France
The Draft IS0 Recommendation was then submitted by correspondence
to the IS0 Council, which decided, in February 1959, to accept it as an
IS0 RECOMMENDATION.
* These Member Bodies stated that they had no objection to the Draft being approved.
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ISO/R 84 - 1959 (E)
IS0 Recommendation R 84 February 1959
IZOD IMPACT TEST FOR STEEL
1. PRINCIPLE OF TEST
The test consists in breaking by one blow from a swinging hammer, under
conditions defined hereafter, a notched test piece, gripped vertically, with the
bottom of the notch in the same plane as the upper face of the grips. The blow is
struck on the same face as the notch at a fixed position. The energy absorbed is
determined and from this the impact value is deduced.
2. TEST PIECES
The test piece is of square or round section, unless otherwise specified.
2.1
2.2 The test piece conforms to the dimensions given in the following figures:
(a) Square test pieces: single-notch, Figure 1 1 page
two-notch Figure 2
three-notch Figure 3 I
Round test pieces : single-notch
(b)
two-notch Figure 6
three-notch Figure 7 \
2.3 In each case, the plane of symmetry of the notch is perpendicular to the
longitudinal axis of the test piece. The surface of the test piece should be
smooth and free from grooves running parallel to the plane of symmetry of
the notch.
2.4 The notch is of V-form having an included angle of 45". The notch
The notch should be carefully
may be made by any machining method.
so that no grooves appear at the base of the notch.
prepared
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ISO/R 84 - 4959 (E)
2.5 Square test pieces. The notch is 2 mm deep with a root radius of 0.25 mm
(Fig. 4, page 7).
Dimensions in millimetres 28 -
I
Striking distance
of pendulum
75 min.
FIG. 1. -Single-notch square test piece
Dimensions in millimetres
Hammer
strikes
here
---
Striking distance
of pendulum
FIG. 2. - Two-notch square test piece
Dimensions in millimetres 28 28 28
-,
I- I=
Hammer
strikes
here 131 --
Striking distance
of pendulum
130 min.
FIG. 3. - Three-notch square test piece
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E
45"
Dimensions in millimetres
c\l t
t
Root radius
0.25
FIG. 4. - Enlarged view of notch for square test piece
2.5.1 The following tolerances are permitted :
TABLE 1. - Tolerances on specified dimensions
Machining tolerance
Designation R'ominal dimension
ISA
Sgnlbols
Minimum length :
75 mm
single-notch
two-notch 100 mm
three-notch 130 mm
10 mm & 0.11 mm j 13
Thickness
j 13
Width 10 mm f 0.11 mm
-
45"
Angle of notch
f 2"
Depth below notch 8 mm f 0.045 mm j 11
Distance of notch from end
of test piece and from adja-
28 mm f 0.42 mm j 15
cent notch
Angle between plane of sym-
metry of notch and the longi-
-
90"
tudinal axis of the test piece i 2"
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J
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